If ??/?z = 0, the atmosphere is said to be neutral,or neutrally stratified, and the lapse rate is equal to the dry adiabatic lapse rate (DALR) Gd ~= 10 K km-1 i.e. the temperature decreases by 10 K every km.
https://www.powershow.com/view1/ee495-ZDc1Z/If_z_0_the_atmosphere_is_said_to_be_neutral_or_neutrally_stratified_and_the_lapse_rate_is_equal_to_the_dry_adiabatic_lapse_rate_DALR_Gd_10_K_km-1_i_e_the_temperature_decreases_by_10_K_every_km_powerpoint_ppt_presentation
 Gd ~= 10 K km-1 i.e. the temperature decreases by 10 K every km.&media=https://s3.amazonaws.com/images.powershow.com/P1254325699NRHPg.pr.jpg)
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